| 摘要 |
FIELD: filtration of products delivered from oil, water and gas wells. SUBSTANCE: this filter retains safety of its metal net with wire winding during lowering into incline and horizontal wells, filtration of air is improved, and stability of filter is ensured against crushing under action of abnormally high pressure in deep wells. Filter has perforated tube which is embraced by external metal net and wire winding. Metal net with wire winding is located between ribs of perforated tube. Ribs on outer surface of rib are arranged along spiral line at certain pitch selected according to given conditions. EFFECT: high efficiency. |
